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Which number is not composite 2,9,15,21
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Which number is not composite 2,9,15,21

User Daniel Netzer
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2 Answers

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2 is the only number that is prime. The others are composite because they have factors other than 1 and itself.
User Stephen Hazel
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A composite number is divisible by other numbers, including 1 and itself.

Opposite of composite is prime, so we need to look for the PRIME number.

2 is a prime number because it is only divisible by 1 and itself(2).

Answer: 2
User Niloct
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